[drone]

Has been most excellent so far, I suspect I'm about 75% through single player. Also played some co-op on the night it was released, about 80% of it (in around 4ish hours), was pretty awesome.

It doesn't take long to develop a bit of a language to describe to the other person what you think is required, and the extra pair of eyes helps a lot with some of the puzzles. Some had us in stitches for how absurdly long we took to come up with what suddenly was the obvious answer right in front of us.

Not sure co-op would be that replayable mixing someone who hadn't done it with someone who had. Helps if you both haven't seen them solved before, I think.